Core-drill.



M. J. MOLOUG'HLIN & J. S. WYNN.

GORE DRILL. APPLICATION IILBD SEPT. 28, 1908.

Patented Aug. 3, 1909.

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9/01 1" use o UNITED STATES PATENT OFFICE.

MALACHA J. MCLOUGHLIN, OF SOURLAKE, AND JOHN S. WYN N, OF BEAUMONT, TEXAS.

GORE-DRILL.

Specification of Letters Patent.

Patented Aug. 3, 1909.

Application filed. September 28, 1908. Serial No. 455,137.

Jefferson and State of Texas, have invented Fig. 5 is an edge view of cap plate.

certain new and useful Improvements in (.ore-Drills, of which thefollowing'is a specilication.

Our invention relates to-that class of drills known as core drills, which are used in boring for mineral deposits and for similar purposes, and by the use of which, cylindrical masses or cores may be removed in tact from the boring, showing the character of the stratas encountered during the boring operation; and it also relates to the construction of the core-lifting or gripping device by which the core is gripped, broken off,

and held for lifting it from the bored hole in.

withdrawing the drilling-tool therefrom.

It is well known that the most rapid and economical method of making a bore-hole in rock and many other substances is by means of a practical core drill, and it is also best adapted for exploring certain kinds of mincralized formations, owing to the fact that a drill of this character does not cut up and pulverize the whole mass of rock or other substance through which it passes, but instead only a small portion thereof, and our invention consists in certain peculiar and novel features of construction and arrangement, as hereinafter fully described and claimed.

An embodiment of the invention that is at present considered the preferable one is disclosed in the accompanying drawings, wherein Figure 1 is a vertical side elevation. Fig. 2 is a vertical sectional view. Fig. 3 is a bottom view ofFig. 1 showing the cutters in place. Fig. 4 is a bottom view of the cylinder with cap plate and cutters removed. Fi 6 is a top plan view of the same. Fig. 7 is an enlarged side view of one of the double cutters, and Fig. 8 is an enlarged view of one of the single or intermediate cutters.

Similar reference letters designate corresponding parts in all the figures of the drawin s. i

%& designates a bit or tubular drill-head, having a portion of its upper end A chambered and threaded internally, into which is screwed a pipe or tubular drill-rod, (not preferred length, and also of any preferre( internal and external diameter, as the requirements of the articular classes of work may render dcsira le. The internal diameter of the bit or drill-head being preferably somewhat less. than the diameter of the bore of the pipe or tubular drlLrod.

1n the lower face of the tubular drill-head A are provided a series of radially disposed recesses A and A in which are ournaled respectively, serrated chilled steel cutters B and C, preferably twice as many of the former as of the latter, the cutters B have a central bearing a and are rovided with cone shaped serrations at hot ends for removing the outer and inner ortions of an annular groove in the rock, w ile the cutter shown) of any C has a journal b at each side of a central serrated conical portion for removing the annular ring of rock left by the operation of the double cutters- To the lower end of the tubular drill-head A of the present and preferred embodiment is attached a cap plate D, of the same external and internal diameter as the drill-head; the said cap plate is rovided with a series of recesses D to receive the double steel cutters B, and recesses D to receive the single steel cutters C and the cap plate is firmly secured to the lower face of the tubular drill-head by screws 0, passing through holes cl in the plate, and in corresponding, threaded holes e in the drillhead. At the lower extremity of the threaded portion A of the drill-head A is a slot E in which a deg F is loosely pivoted by pin G; this dog raises and slides freely down the core as it 18 made, but will dig into and catch the core when the drilling tool is drawn from the well. The core will thus be broken off and retained in the barrel until the sur face is reached. To remove the core from the barrel after the same has been withdrawn from the borehole, it is first necessar to unscrew the drill-head from the tubu ar drill red, when the core may be easily removed.

From the foregoing 1t is thought that the construction, operation, and many advantages of the herein-described mventlon will be apparent to those skilled in the art w1thout further description, and it will be understood that various changes in the size, shape, proportion, and minor details of constructlon may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention. 

